Methodology for Forming and Placing Lunar Concretes

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Title: Methodology for Forming and Placing Lunar Concretes

Author(s): Richard A. Kaden

Publication: Special Publication

Volume: 125

Issue:

Appears on pages(s): 71-96

Keywords: aggregate gradation; concretes; conveyors; curing; lunar bases; forming techniques; grout; inflatable structures; mix proportioning; placing; precast concrete; preplaced aggregate concrete; shotcrete; General

Date: 5/1/1991

Abstract:
The methodology for forming and placing lunar concretes will incorporate our present technology as well as add the innovations that will be developed in the years to come. Initial habitation will combine the use of inflatable forms, precast modules, and self-contained modules that are landed on the lunar surface. The forming and placing systems used for cast-in-place lunar concrete may include temporary stay-forms, preplaced aggregate concrete (which utilizes injection grouting), air-o-form system, and precast concrete. Lightweight fiberglass formties have great potential for lunar construction. A case history and discussion for preplaced aggregate concrete usage is provided for the Peoria Lock Resurfacing Project. The placement size was 1 ft (0.3048 m) wide x 40 ft (12.2 m) long x 10 ft (3.1 m) deep. The maximum size aggregate was 3 in. (7.6 cm) for increased economy. Typically, the angle of repose for the grout was 1:10. Test results for 7-day and 28-day compressive strengths for 2 in. (5 cm) mortar cubes, preplaced aggregate concrete cylinders, and conventional concrete are given. Other items discussed in the article are concretes for a lunar landing support facility, modified shotcreting and curing methods, and a variety of modified inflatable form structures.